Figure Two
Figure Two is generated by a very gentle tap on the same top plate stock with my specially designed lead tapping pencil. Notice that there is a "fundamental" tap tone, the lowest frequency major response, at 494 HZ and that although this fundamental frequency appears in both figure one and two, there is much less overtone 'noise' for our ears to filter out.
I believe that these sound charts illustrate the major difficulty in harnessing tap tone tuning as a useful tool for instrument making and adjustment. Our ears more easily hear the higher frequencies, so when listening for the important 'fundamental' tap tone we can be mislead.
My experience with tap tone tuning is that only the fundamental (tap tone) response is important for adjustments.
You might practice hearing the fundamental tone by listening to orchestra music and selecting only the notes of the double bass during the performance; in other words, the key skill necessary for using tap tones is to train our ears to hear the lowest fundamental part of the tap tone sound spectrum, and to eliminate (as much as possible) the higher confusing overtones.



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